USB: usbserial: provide ezusb functions for an external module.

When building an external module, the ezusb_* functions are not defined
if we haven't loaded any built'in module that use them (whiteheat,
keyspan, ...).

This patch allow to build those functions even if we only have selected
the usbserial generic driver.
Signed-off-by: Paul Chavent <paul.chavent@fnac.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/Kconfig

@@ -43,6 +43,12 @@ config USB_SERIAL_CONSOLE
 
 	  If unsure, say N.
 
+config USB_EZUSB
+	bool "Functions for loading firmware on EZUSB chips"
+	depends on USB_SERIAL
+	help
+	    Say Y here if you need EZUSB device support.
+
 config USB_SERIAL_GENERIC
 	bool "USB Generic Serial Driver"
 	depends on USB_SERIAL
@@ -105,6 +111,7 @@ config USB_SERIAL_CH341
 config USB_SERIAL_WHITEHEAT
 	tristate "USB ConnectTech WhiteHEAT Serial Driver"
 	depends on USB_SERIAL
+	select USB_EZUSB
 	help
 	  Say Y here if you want to use a ConnectTech WhiteHEAT 4 port
 	  USB to serial converter device.
@@ -296,6 +303,7 @@ config USB_SERIAL_IUU
 config USB_SERIAL_KEYSPAN_PDA
 	tristate "USB Keyspan PDA Single Port Serial Driver"
 	depends on USB_SERIAL
+	select USB_EZUSB
 	help
 	  Say Y here if you want to use a Keyspan PDA single port USB to
 	  serial converter device.  This driver makes use of firmware
@@ -307,6 +315,7 @@ config USB_SERIAL_KEYSPAN_PDA
 config USB_SERIAL_KEYSPAN
 	tristate "USB Keyspan USA-xxx Serial Driver"
 	depends on USB_SERIAL
+	select USB_EZUSB
 	---help---
 	  Say Y here if you want to use Keyspan USB to serial converter
 	  devices.  This driver makes use of Keyspan's official firmware
@@ -549,6 +558,7 @@ config USB_SERIAL_CYBERJACK
 config USB_SERIAL_XIRCOM
 	tristate "USB Xircom / Entregra Single Port Serial Driver"
 	depends on USB_SERIAL
+	select USB_EZUSB
 	help
 	  Say Y here if you want to use a Xircom or Entregra single port USB to
 	  serial converter device.  This driver makes use of firmware
@@ -596,11 +606,6 @@ config USB_SERIAL_DEBUG
 	  To compile this driver as a module, choose M here: the
 	  module will be called usb-debug.
 
-config USB_EZUSB
-	bool
-	depends on USB_SERIAL_KEYSPAN_PDA || USB_SERIAL_XIRCOM || USB_SERIAL_KEYSPAN || USB_SERIAL_WHITEHEAT
-	default y
-
 
 endmenu
 

drivers/usb/serial/ezusb.c

@@ -53,6 +53,6 @@ int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit)
 }
 
 
-EXPORT_SYMBOL(ezusb_writememory);
-EXPORT_SYMBOL(ezusb_set_reset);
+EXPORT_SYMBOL_GPL(ezusb_writememory);
+EXPORT_SYMBOL_GPL(ezusb_set_reset);